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The Factory pattern is applicable for a single class whereas AbstractFactory is for a set of classes. AbstractFactory uses the Factory pattern for each class in addition to defining a few other things.
With the Factory pattern, you produce implementations (Apple, Banana, Cherry, etc.) of a particular interface -- say, IFruit.
With the Abstract Factory pattern, you produce implementations of a particular Factory interface -- e.g.,IFruitFactory. Each of those knows how to create different kinds of fruit.
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